SGH-X481 Flow Chart of Troubleshooting
2-12
2-2. RF
2-2-1. GSM Rx
Normal condition
catch the
channel ?
Check U900
pin 12
≥
-65
dbm ?
Check U801
pin 21,22
≥
-
65dBm ?
Yes
No
No
Check U900
pin 16
≥
-65
dbm ?
Yes
No
Yes
Check ANT,
C824,C825,C904,C903
Resolder or change
CON901, C903, L903, L904, C901, C902
Resolder or change
U900
Resolder or change
F900
Resolder or change
U600
CONTINOUS RX ON
RF INPUT : 62CH
AMP : -60dbm
Check U801
pin 13 = 2.9V
Yes
Resolder or change
U100
Yes
No
No
1
2
3
4
5
Содержание SGH-X481
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